filter2.corp.mxs.au has no CNAME records.
Question and response
Question
dig filter2.corp.mxs.au. NS
Answer
The response has no answer records.
Authority
mxs.au. 900 SOA ns1.corp.ventraip.net.au. servers.vip-servers.com. 2026022703 3600 1800 1209600 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0